Norepinephrine and epinephrine are considered to be ________ when released into the bloodstream, but ________ when released at synapses. 1. neurotransmitters; hormones 2. neuropeptides; neurotransmitters 3. hormones; neurotransmitters 4. neurotransmitters; neuropeptides 5. neuropeptides; neurohormones
Norepinephrine and epinephrine are considered to be ________ when released into the bloodstream, but ________ when released at synapses.
1. neurotransmitters; hormones
2. neuropeptides; neurotransmitters
3. hormones; neurotransmitters
4. neurotransmitters; neuropeptides
5. neuropeptides; neurohormones
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